Fix a format for S3 listing headers.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 70.04%. Comparing base (52ba813) to head (8d9f4c3). Report is 24 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2799 +/- ## ============================================ + Coverage 64.24% 70.04% +5.79% - Complexity 10398 11681 +1283 ============================================ Files 840 841 +1 Lines 71755 72155 +400 Branches 8611 8684 +73 ============================================ + Hits 46099 50539 +4440 + Misses 23004 18972 -4032 + Partials 2652 2644 -8 ```

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